Some Components cannot be dropped in OPM

Dear All, 

I am encountering one proplem. I wanted to update or make changes of existing piping components came from vendor or consultant. For example, a valve or flowmeter. I first tried to drop the component to manipulate. But when I dopped it in OPM, it disappered. I treid turning on/ off display set. But the issue still exists. So whenever I wanted to do that, I opened that file on Microstation or OBD, it drops easily. But for me, it's quite troublesome to open/ close in OPM & OBD. May I know what is the issue with dropping on OPM. Any other ways to expedite the process? Thank you. 

Regards, 

Thiha 

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